TireSizesFinder

235/55R20 vs 265/40R22

265/40R22 is 0.17 in (4.3 mm) taller than 235/55R20, a +0.56% diameter difference. With the speedometer set for 235/55R20, an indicated 60 mph is 60.3 mph on 265/40R22.

Is this a safe swap?

Diameter difference +0.56%: under 1%

By overall diameter alone, 265/40R22 is a near match for 235/55R20; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 235/55R20 (30.18 in) vs 265/40R22 (30.35 in)235/55R2030.18 in × 9.25 in265/40R2230.35 in × 10.43 in
Side profile and tread width, drawn to the same scale.
235/55R20 vs 265/40R22 differences
Measurement235/55R20265/40R22Difference% diff
Overall diameter30.18 in (766.5 mm)30.35 in (770.8 mm)+0.17 in (+4.3 mm)+0.56%
Sidewall height5.09 in (129.3 mm)4.17 in (106.0 mm)−0.92 in (−23.2 mm)−17.99%
Section width9.25 in (235.0 mm)10.43 in (265.0 mm)+1.18 in (+30.0 mm)+12.77%
Circumference94.80 in (2,408.0 mm)95.34 in (2,421.5 mm)+0.53 in (+13.5 mm)+0.56%
Revolutions per mile668665−4−0.56%
True speed with the speedometer calibrated for 235/55R20
IndicatedActual on 235/55R20Actual on 265/40R22Difference
30 mph30.0 mph30.2 mph+0.2 mph
60 mph60.0 mph60.3 mph+0.3 mph
75 mph75.0 mph75.4 mph+0.4 mph

Ride-height change: 265/40R22 raises the vehicle by 0.08 in (2.1 mm) at the axle (half the +4.3 mm diameter difference).

265/40R22 is 0.17 in taller than 235/55R20 and 30 mm wider, a 0.56% difference in overall diameter.

With the speedometer calibrated for 235/55R20, an indicated 60 mph is actually 60.3 mph on 265/40R22, and revolutions per mile change from 668 to 665.

265/40R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 235/55R20.

Size pages

Other comparisons with 235/55R20

Other comparisons with 265/40R22

Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.